CN113265759A

CN113265759A - Method for fitting guide bar with needles

Info

Publication number: CN113265759A
Application number: CN202010268470.1A
Authority: CN
Inventors: G.舒勒; S.考夫霍尔德; A.温特迈尔
Original assignee: Carlmeyerstol R & D Co ltd
Current assignee: Carlmeyerstol R & D Co ltd
Priority date: 2020-02-17
Filing date: 2020-04-08
Publication date: 2021-08-17
Anticipated expiration: 2040-04-08
Also published as: EP3636816A2; CN113265759B; EP3636816A3; EP3636816B1

Abstract

The invention relates to a method for equipping a bar of a warp knitting machine with a knitting tool (2), in which method the knitting tool (2) is inserted into a groove (3) of a needle bed (4) of the bar, wherein the groove (3) has a predetermined gauge. High productivity of the warp knitting machine is intended to be achieved. For this purpose, a knitting tool (2) is used in a receptacle (6) of the insertion tool (1), said receptacle having the predetermined gauge, wherein the insertion tool (1) is positioned on the needle bed (4) and the knitting tool (2) is transferred into the groove (3) by means of the insertion tool (1).

Description

Method for fitting guide bar with needles

Technical Field

The invention relates to a method for equipping a bar of a warp knitting machine with knitting tools, in which method the knitting tools are placed into grooves of a needle bed of the bar, wherein the grooves have a predetermined gauge.

Furthermore, the invention relates to a placement tool suitable for this purpose.

Background

In a warp knitting machine, different knitting tools work together to form a stitch, the knit comprising said stitch. In this case, the same type of knitting tools are fixed to the guide bar, so that they can also be moved in the same type (gleichirtig) during the stitch formation.

The invention should subsequently be described in terms of a structuring needle in the form of a sliding needle. However, it can also find application in the case of other knitting tools.

The sliding needle is arranged at the knitting needle bar and is fixed there. For this purpose, the knitting needle bar has a needle bed provided with grooves. Each sliding pin is then placed into one such slot.

In the case of warp knitting machines, a number of sliding needles are fixed at the knitting tool bar, depending on the so-called "fineness" of the respective knitting needle bar. This results in 36 sliding needles per inch with fineness E36, i.e. far in excess of 1000 sliding needles per meter.

Sliding needles and other knitting tools are wear parts that must be replaced from time to time. When replacing the sliding needle, the worker must take the old sliding needle out of the needle bed and insert a new sliding needle. The equipping of the knitting needle bar is time-consuming on the basis of the large number of sliding needles. The equipment is prone to errors, since the sliding needle can also be easily damaged outside the needle bed, for example by deformation.

That is, equipping the bars of a warp knitting machine with knitting tools requires a relatively long period of time during which the warp knitting machine is not at its disposal for production.

Disclosure of Invention

The invention is based on the object of achieving a high productivity of a warp knitting machine.

The object is achieved with a method of the type mentioned at the outset by the use of a knitting tool held in a receptacle of a setting tool, which receptacle has a predetermined gauge, wherein the setting tool is positioned at the needle bed and the knitting tool is transferred into the groove by means of the setting tool.

The knitting tools, that is to say the sliding needles (Schiebernadeln) in the present exemplary embodiment, are no longer individually removed from the packaging and are inserted into a corresponding groove in the needle bed. More precisely, the knitting tools are arranged in groups in the insertion tool and already match the gauge of the slots of the needle bed. That is, the worker must merely also guide the drop tool with the knitting tool located therein to the needle bed and move the knitting tool from the drop tool directly into the slot of the needle bed. Wherein the time during which the knitting tool is deformed is thereby kept small, since it is not supported to a sufficient extent. This keeps the risk of damage small. Furthermore, a plurality of knitting tools can be handled simultaneously, so that the time for equipping can likewise be kept small. An orientation process (Ausrichttvorgang) which is also essentially only once is necessary. Since the insertion tool has the same gauge as the grooves of the needle bed, it is sufficient for the worker to position the individual knitting tool such that it can be moved into the corresponding groove at the needle bed of the guide bar. The other knitting tools in the insertion tool then follow the positioning automatically and correctly.

Preferably, an insertion tool is used from which the braiding tool protrudes with its longitudinal sides. The knitting tool can then be introduced with its longitudinal side into the groove of the needle bed, so that the knitting tool is held by the needle bed on the one hand and by the drop-in tool on the other hand in a phase of the equipping process. The risk of deformation of the knitting tool is thereby kept small. While ensuring that all knitting tools contained in the insertion tool can be safely transferred into the slots of the needle bed.

Preferably, the insertion tool with the knitting tool is pressed in the direction of the needle bed. The knitting tool is pressed with its longitudinal side into a groove of the needle bed and is held there. This can in practice take place simultaneously for all knitting tools accommodated in the insertion tool.

Preferably, a placement tool is used in which the knitting tool is held in a friction-fit manner with a holding force which is greater than the weight force of the knitting tool. It is thus also possible to apply the setting tool upside down (Ü ber Kopf), so that it is also possible to set the knitting needles in the direction of gravity from above into the grooves of the needle holder, which is sometimes necessary. Even when the insertion tool has to be manipulated in other orientations in order to fit the knitting tool at the guide bar, there is no risk of the knitting tool falling out of the insertion tool under the influence of gravity.

Preferably, the holding force is smaller than the clamping force with which the knitting tool is held in the groove of the needle bed. When the knitting tool is inserted into the slot of the needle holder, it is fixed there by a friction fit. The insertion tool can then be pulled out of the knitting tool without any problem. The different forces can be generated in a simple manner, for example, by the slots of the needle bed being implemented with a smaller tolerance than the receptacle into which the tool is inserted. The receptacle of the insertion tool can be dimensioned in relation to the knitting tool in such a way that, when the knitting tool is arranged in the groove of the needle bed, the knitting tool cannot fall out under the influence of gravity on the one hand, but can be pulled out of the receptacle on the other hand. It is not necessary here that the knitting tool has been completely inserted into the groove of the needle bed.

Preferably, the insertion tool is inclined with respect to the longitudinal extension of the knitting tool after the transfer of the knitting tool into the slot of the needle bed. This facilitates the removal of the insertion tool from the knitting tool. The force necessary for pulling out the insertion device from the knitting device can be distributed over a certain period of time, so that the force necessary for pulling out the insertion device from the knitting device can be kept small overall. This is also a possibility to ensure that the knitting tools do not move out of the slots of the needle bed when removing the insertion tools.

Preferably, the knitting tool is pressed further into the slot of the needle holder after removing the drop-in tool. That is to say, the insertion tool is allowed to press the knitting tool into the groove of the needle holder only up to a certain depth and after that the knitting tool is inserted into its final position, for example by pressing with the fingers of a worker or a corresponding tool. This finger pressure is not significant because the knitting tool has been slightly (etwa) submerged in the slot of the needle bed.

Preferably, an insertion tool is used which has a stop, against which the braiding tool bears in the longitudinal direction. The knitting tools are thus already oriented relative to each other along their longitudinal extension in the insertion tool, which further facilitates the feeding of the guide bar.

The object is achieved by an insertion tool having a main body with a receptacle with a predetermined gauge, in which a knitting tool is arranged, wherein the main body is formed from a plastic material and the receptacle is designed as a seam.

The plastic material is sufficiently resilient so that the knitting tool can be held in the slit of the insertion tool with a certain friction fit. The insertion tool can thus be handled with a certain degree of robustness (Robustheit) without the risk of the knitting tool being damaged. The body can be manufactured with a desired high degree of accuracy. Tolerances in the order of hundredths of a millimeter can be achieved. Accordingly, it is achieved in a simple manner that the gauge of the receptacle and the gauge of the groove in the needle bed are brought into agreement with the necessary accuracy.

Preferably, the knitting tool is arranged in the receptacle. Such a placement tool can thus be guided in a simple manner to the needle bed of the guide bar and the knitting tool can be transferred directly from the placement tool into the needle bed.

This is particularly simple when the knitting tool projects with its longitudinal side from the receiving portion. The knitting tool can thereby be introduced with this longitudinal side into the groove of the needle bed, so that the knitting tool is fixed in said groove. The insertion tool can then be removed.

Preferably, the knitting tool protrudes beyond the insertion tool in its longitudinal direction. The worker can fix the knitting tool in the groove of the needle bed when the worker pulls the putting tool out of the knitting tool. This makes assembly easy.

Preferably, the plastic material has a length expansion coefficient of less than 0.005 per 1% water retention (wassereinlagering). In other words, the length change is only a few thousandths per percent water retention. This is sufficient for maintaining the gauge accuracy to such an extent that the knitting tool can be transferred without problems from the laying tool into the groove of the needle bed. Such plastic material is for example acrylate monomers or other acrylic plastics, preferably polymethyl methacrylate. The plastic material can also have further additives, for example stabilizers.

Preferably, the body has a stop, which is arranged transversely to the receptacle. When the knitting tool is assembled, the knitting tool can then abut against the stop. Regardless of whether such a stop is present or absent, the insertion tool can already be equipped with the knitting tool in the case of the manufacturer of the knitting tool. Such equipping can be carried out mechanically, which is fast and reliable. The risk of damage to the braiding tool when it is put into the tool equipment can be kept small.

Preferably, the body has an extension transverse to the housing which is a maximum of 2 inches. Although the number of knitting tools that can be simultaneously transferred into the slots of the needle bed of the guide bar is thereby limited, the limited width allows better handling for the worker. In addition, there is little risk of the setting tool arching. Unevenness (Ebenheit) well below 0.1mm can be achieved.

Preferably, a friction-reducing agent is arranged between the receptacle and the knitting tool. Such friction-reducing agents, which can also be referred to as "lubricants", have the advantage that, when the knitting tools are accommodated in the slots of the needle bed, they make it easier for the knitting tools to be extracted from the accommodation of the insertion tool and thus for the insertion tool to be removed from the knitting tools. On the other hand, such lubricants often also exert a certain adhesive effect, so that it is possible in a simple manner to prevent the knitting tool from being able to move out of or fall out of the receiving portion of the insertion tool under the influence of gravity.

Drawings

The invention is described hereinafter with reference to the accompanying drawings according to preferred embodiments. Wherein:

figure 1 shows a perspective illustration of an insertion tool,

figure 2 shows a very schematic illustration of the feeding of the guide bar,

and figure 3 shows a very schematic representation in the insertion tool.

Detailed Description

In all the figures, identical elements are provided with the same reference numerals.

The illustrations in the drawings are very schematic and not to scale.

Fig. 1 shows a see-through illustration of a drop tool 1 which can be applied in order to insert a knitting tool 2 (fig. 2 and 3) into a groove 3 of a needle bed 4 of a guide bar which is not shown in greater detail.

The insertion tool 1 has a main body (Korpus) 5 with a plurality of receptacles 6 configured for the knitting tool 2. The receptacles 6 are separated from each other by spacers 7. The spacers 7 are shown here with an excessively large thickness. The spacers can be constructed relatively thin, depending on the fineness of application. The current practical minimum is about 0.15 mm. The width of the receptacle 6 corresponds to the corresponding width of the knitting tool 2.

The receptacle 6 is open to the side of the insertion tool 1. At the opposite end, a stop 8 is provided, against which the knitting tool 2 rests with an end 9. The end is preferably the end where the knitting tool 2 has a stitch 10.

The other end of the knitting tool 2 with the needle 11 protrudes from the open end of the receptacle 6, as can be seen from fig. 3.

The receptacle 6 has a slightly greater tolerance with respect to the knitting tool 2 than the slots 3 of the needle bed 4. Furthermore, the body 5, which is formed in one piece with the web 7, is formed from a plastic material which is elastic to a certain extent. That is, the knitting tool 2 can be held in the receptacle 6 with a friction fit. The stop 8 enables the orientation of all knitting tools 2 in the insertion tool 1 in the longitudinal direction of the knitting tools 2.

The force with which the insertion tool 1 fixes the knitting tool 2 is greater than the weight force of the knitting tool 2. That is, it is possible, as shown in fig. 2, to actuate the insertion tool 1 in such a way that the knitting tool 2 is arranged in the direction of gravity below, without the knitting tool 2 falling out of the insertion tool 1.

However, once the knitting tool 2 is introduced into the groove 3, it is fixed with a certain clamping force in the groove 3 of the needle receiving portion 4 of the guide bar, on account of large tolerances. For this purpose, it is sufficient that the braiding tool 2 is introduced into the groove 3 over a relatively small section (Strecke). As can be seen in fig. 2, it is not necessary for the knitting tool 2 to be introduced into the groove 3 as far as a stop. More precisely, the insertion tool 1 can already be pulled out of the knitting tool 2 when the knitting tool 2 is introduced 1 to 2mm into the groove 3 of the needle holder 4.

As already mentioned above, the knitting tool 2 protrudes at one end from the insertion tool 1. That is, when the worker positions the knitting tool 2 in the slot 3 of the needle holder 4 by means of the insertion tool 1, he can fix the protruding end of the knitting tool 2 with fingers or corresponding tools and press it into the slot 3 of the needle holder 4 and then remove the insertion tool 1. In this case, it is expedient to tilt the insertion tool 1 relative to the braiding tool 2, i.e. for example to lift the end of the insertion tool 1 facing the needles 11 of the braiding tool 2 and then to increase the angle between the braiding tool 2 and the insertion tool 1 incrementally. Of course a tilt in another direction is also possible.

It is also possible to arrange a lubricant or friction-reducing agent between the knitting tool 2 and the insertion tool 1. Such a lubricant can be, for example, oil or the like. This lubricant has on the one hand a certain adhesive effect, so that the knitting tool 2 is also held in the receptacle 6 against the action of gravity. On the other hand, this lubricant facilitates the pulling-out of the insertion tool 1 from the knitting tool 2.

As mentioned above, it is not necessary for the insertion tool 1 to press the knitting tool 2 completely, i.e. up to the stop, into the groove 3 of the needle bed 4. The worker can, after he has removed the insertion tool 1 from the knitting tool 2, press the knitting tool 2 further into the slot 3 of the needle holder 4 until the knitting tool 2 abuts at the base of the slot 3. The knitting tool 2 can then be fixed in the usual manner at the needle bed 4 of the guide bar, for example by means of a cover.

Claims

1. Method for equipping a bar of a warp knitting machine with knitting tools (2), in which method the knitting tools (2) are placed into grooves (3) of a needle bed (4) of the bar, wherein the grooves (3) have a predetermined gauge, characterized in that a knitting tool (2) held in a receptacle (6) of a placing tool (1) having the predetermined gauge is applied, wherein the placing tool (1) is positioned at the needle bed (4) and the knitting tool (2) is transferred into the groove (3) by means of the placing tool (1).

2. Method according to claim 1, characterized in that an insertion tool (1) is applied from which the braiding tool (2) protrudes with its longitudinal sides.

3. Method according to claim 2, characterized in that the placing tool (1) with the knitting tool (2) is pressed in the direction onto the needle bed (4).

4. Method according to any one of claims 1 to 3, characterized in that a lowering tool (1) is applied in which the braiding tool (2) is held in a friction fit with a holding force which is greater than the weight force of the braiding tool (2).

5. Method according to claim 4, characterized in that the holding force is smaller than a clamping force with which the knitting tools (2) are held in the slots (3) of the needle bed (4).

6. Method according to any one of claims 1 to 5, characterized in that the depositing tool (1) is tilted with respect to the longitudinal extension of the knitting tool (2) after transferring the knitting tool (2) into the slot (3) of the needle bed (4).

7. Method according to any one of claims 1 to 6, characterized in that the knitting tool (2) is pressed further into the slots (3) of the needle bed (4) after removing the insertion tool (1).

8. Method according to any one of claims 1 to 7, characterized in that an insertion tool (1) with a stop (8) is applied, at which stop the braiding tool (2) bears in the longitudinal direction.

9. Insertion tool (1) having a body (5) with a receptacle (6) having a predetermined distance, wherein the body (5) is formed from a plastic material and the receptacle (6) is designed as a slit.

10. Insertion tool according to claim 9, characterized in that a knitting tool (2) is arranged in the receptacle, which knitting tool protrudes beyond the insertion tool (1), in particular in its longitudinal direction.

11. Insertion tool according to claim 10, characterized in that the knitting tool (2) protrudes with a longitudinal side from the receiving portion (6).

12. The insertion tool according to any one of claims 9 to 11, wherein the plastic material has a coefficient of length expansion of less than 0.005 per 1% water retention.

13. The insertion tool according to one of the claims 9 to 12, characterized in that the main body (5) has a stop (8) which is arranged transversely to the receptacle (6).

14. The insertion tool according to any one of claims 9 to 13, characterized in that the main body (5) has an extension transverse to the accommodation (6) of a maximum of two inches.

15. The insertion tool according to any of the claims 10 to 14, characterized in that a friction-reducing agent is arranged between the receptacle (6) and the knitting tool (2).